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Glen Canyon Dam, Arizona. Nearing completion on the Colorado River is this 580 ft. concrete arch dam behind which an 186 mile-long Lake Powell backs up. The bridge carrying U.S. 89 is 700 ft. above the water. (Caption given by Josef Muench)

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Glen Canyon Dam, Arizona. Nearing completion on the Colorado River is this 580 ft. concrete arch dam behind which an 186 mile-long Lake Powell backs up. The bridge carrying U.S. 89 is 700 ft. above the water. (Caption given by Josef Muench)